Matt Truelove beat David Allingham to the top of the first practice timesheets by 0.056secs as the action got underway at Donington Park this morning.
Truelove banked a best lap of 1min 30.381s to end the session ahead, as Allingham was second and Declan Connell third.
Fourth fastest was Luke Mossey, as Simon Reid rounded out the top five.
Pirelli National Superstock Championship, FP1:
1. Matt Truelove (TAG Racing Honda) 1min 30.381s
2. David Allingham (SMS/Nicholl Oil BMW) +0.056s
3. Declan Connell (Rapid Honda with Drivelife) +0.121s
4. Luke Mossey (Milenco by Padgetts Honda) +0.181s
5. Simon Reid (Carl Cox BMW by MLav Racing) +0.270s